Add project structure, features and placeholders

Added

• README, contains short info abut this project.
• CHANGELOG, contains notable changes to this project.
• DEVCORE contains motivation and development details.
• MIT LICENCE
• Basic project folder and file structure (bin, lib, test).
• Rakefile for tests and Gemfile.
• [feature] Hero, a miserable little pile of numbers.
• [feature] Room, a place where the Hero looks at things and such.
• [feature] Dungeon, which randomly places rooms for each new adventure.
• [feature] Book, because keeping a bunch of strings with logic is not fun.
• [feature] Satchel and Item, where the hero can place items obtained.
• [feature] Event, which the Hero can trigger while in some of the rooms.
• Documentation, for most classes and features.
• Placeholders, for rooms not yet implemented, at least you get a shiny.